- Added support for json response writer in SolrClient
- Removed final bit from classes so that they can be mocked in unit tests
- Changed from beta to stable
- Included phpdoc stubs in source to enable autocomplete of Solr classes and methods in IDE during development
- Lowered libxml2 version requirement to 2.6.16

- Added ability to specify response writer in constructor option ("wt")
- Added new method to set response writer SolrClient::setResponseWriter()
- Currently, the only supported response writers are 'xml' and 'phpnative'
- Added support for new native Solr response writer
- New response writer is available at https://issues.apache.org/jira/browse/SOLR-1967